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Method of controlling engine stop-start operation for heavy-duty hybrid-electric and hybrid-hydraulic vehicles

  • US 20070124037A1
  • Filed: 03/28/2006
  • Published: 05/31/2007
  • Est. Priority Date: 12/01/2004
  • Status: Active Grant
First Claim
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1. A method of implementing an engine stop-start or idle-stop algorithm for a heavy-duty hybrid-electric vehicle of at least 10,000 pounds Gross Vehicle Weight Rating (GVWR) whereby a crankshaft of the internal combustion engine continues to rotate and the fuel supply is cut off when the vehicle does not need traction power from the internal combustion engine and the fuel supply is automatically turned on to restart the engine when the vehicle needs power from the internal combustion engine, comprising:

  • determining when a State Of Charge (SOC) of an energy storage is above a minimum operating threshold;

    determining when a State Of Charge (SOC) of the energy storage is below a minimum recharge threshold;

    determining when at least one of a vehicle propulsion requirement and an accessories power requirement is below a minimum turnoff threshold;

    determining when at least one of the vehicle propulsion and accessories power requirement is above a minimum startup threshold;

    turning off the fuel supply and turning on the fuel supply to restart the vehicle internal combustion engine;

    rotating the crankshaft of the internal combustion engine when the engine fuel supply is turned off by a generator that is mechanically coupled to the engine to act as a motor to spin the engine.

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